Where I come from (western US) that would be "f*ck me?" I think "interesting" has become the universal anodyne term for dismissal.

That's modern social media and even then partly.

If in work setting your coworkers (god forbid teamleads or managers) interact like that just run, don't try to solve it with conventional reviews or something. Believe me you will not finish blinking before they start misusing this too to cope with their repressed anger through mockery/shallow sarcasm. "nitpick: have you considered escaping user input?"

> A Brit who says "That is an interesting solution!" usually does not feel intellectually stimulated by the solution but is conveying that it is utter garbage.

I can be sarcastic but I have never directed sarcasm towards someone who I am reviewing. (Sarcasm towards third-party code is okay for me.)

I don't know if people who are using sarcasm would want to start labeling things like that as such, since it tends to detract from the intended effect.

Disclaimer: not a Brit.

Well yeah, but in those examples the commenters do not use direct or clear language, they use colloquialisms and passive-aggressive remarks; if you avoid those, a lot of problems with cultural difference are already resolved.